KEF Q90 (1990–1994)
A British-built, three-way floorstanding loudspeaker featuring Uni-Q technology and front-ported bass reflex design.
Overview
The KEF Q90 is a passive floorstanding loudspeaker developed in the early 1990s as part of KEF’s Uni-Q series. Built in England between 1990 and 1994, it was positioned as the flagship model in the Q lineup, designed for listeners seeking the precision of a three-way system with the spatial coherence of KEF’s signature Uni-Q driver array. The speaker uses a bass reflex enclosure with a front-firing port and supports bi-wiring, reflecting KEF’s focus on flexibility and high performance during this era. Marketed under the system designation SP3138, the Q90 was intended to offer both extended frequency response and dynamic headroom, making it suitable for critical stereo listening and multi-channel setups.
Specifications
| Type | 3-way floor standing |
| System | SP3138 |
| Enclosure | Bass Reflex |
| Port Position | Front |
| Impedance | 8 ohms |
| Frequency Response | 51 Hz to 28 kHz |
| Dimensions (H × W × D) | 890 × 260 × 330 mm (35 × 10.2 × 13.6 in.) |
| Net Weight | 18.7 kg (41.1 lb) |
| Unit Quantity | 2 (pair) |
| Bi-wire | Yes |
Design
The KEF Q90 features Uni-Q technology, placing the tweeter at the acoustic center of the midrange cone to create a single point source for improved time coherence and consistent sound dispersion. The cabinet employs a front-ported bass reflex design, enhancing low-frequency extension and output efficiency.
Context
The Q90 was the flagship model in KEF’s Q series, aimed at audiophiles who wanted the performance advantages of a full three-way system. It emphasized compatibility, flexibility, and high-fidelity sound reproduction, with design goals centered on spatial accuracy and dynamic range.
Market
Used pairs have been listed at prices ranging from $150 to $350, with some units noted in good physical and working condition. One owner noted the sound as “muddy in stereo but wonderful in 5.1,” suggesting strong performance in surround applications.
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